I have a Zaurus 5500. Through my own carelessness-I wore out the backup battery. It's not a huge deal-in the rare event I need to do a software reset-I can just restore my data from the CF card quickly using the restore app. I can also avoid having to do this by resetting when I am plugged into an AC outlet.

I am curious if the backup battery is user replaceable-like a CMOS battery on a PC? I have been unable to find detailed schematics on the guts of the 5500-so I don't want to risk taking it apart if I may ruin it in the process. (I've grown quite attached to my Z... ) Rather than waste time calling Sharp Tech Support-I thought somebody may have run into this, and could give me some insight.

Hi Marc,The manual says there is one-and I suspect it did make into production, because I never had a problem with a software reset erasing my data/apps until I let my Zaurus battery rundown completely (accidently).

But like I said-it's a rare occasion my Z gets hung-and when it does-there are a couple of workarounds, so it's not a BIG deal. I'm curious by nature, and I just like everything to work right!

I just upgraded the ROM to Sharp 3.10-so perhaps the rare hanging problem will not show its face again anyway.

Oh Marc-YOU ROCK! Thanks so much. I have looked high and low for specifics on this. I'll let you all know if I get brave enough to try this out, and what I find. What are the chances Radio Shack could get a replacement battery for me, or do you think at this point I should call Sharp and see if they sell them?

My Sharp manual says it's a 3V battery. If I had to guess, I'd bet it's a CR2032, which is an extremely common disc-type battery used in a lot of computers, including PDAs. You can find it almost anywhere, at least in the U.S. (drugstores, Target, Radio Shack).

If you do open your unit up and find out which type it is, I'm sure I'm not the only one who would be interested in knowing for sure. Please post what you find. Good luck!

The battery is not one of the usual CR-20xx series. The SHARPservice manual names it a "Litume battery (ML2016TT2)" theparts code for it is RDNTL0001YCZZ. Looks like it's a Sanyobattery :Sanyo spec sheet.

I regret for making a wrong statement yesterday. I really don'tknow why we were _that_ sure that there was no battery in the5500 models.

I really appreciate all the great info and specifics. I'll see if I can find the battery.I'm sure more than a few fellow Z owners will find this information extremely valuable, and almost impossible to find!

Has anyone succesfully changed their backup battery?? i recently joined in to this dead backup battery business and while i could survive without a backup battery -- it'd be good to know i can replace it with minimal effort.